I want to have a base class called MBUser that has some predefined properties,

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Asked: June 15, 20262026-06-15T00:59:36+00:00 2026-06-15T00:59:36+00:00

I want to have a base class called MBUser that has some predefined properties,

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I want to have a base class called MBUser that has some predefined properties, ones that I don’t want to be changed. If the client wants to add properties to MBUser, it is advised that MBUser be subclassed, and any additional properties be put in there.

The API code won’t know if the client actually subclasses MBUser or not, but it shouldn’t matter. The thinking went that we could just get MBUser by id. So I expected this to work:

def test_CreateNSUser_FetchMBUser(self):
    from nsuser import NSUser
    id = create_unique_id()
    user = NSUser(id = id)
    user.put()
    # changing MBUser.get.. to NSUser.get makes this test succeed
    get_user = MBUser.get_by_id(id)
    self.assertIsNotNone(get_user)

Here NSUser is a subclass of MBUser. The test fails.